Column-strain insulator



July 15, 1924. 1,501,688 y L. STEINBERGER COLUMN STRAIN INSULATOR Original Filed May 23, 1919 lI/VENTOR Patented July 15, 1924.

UNITED STATES LOUIS STEUBEBGEE', OI BROOKLYN, NEW YORK.

COLUMN-STRAIN INSULATOR.

Application filed lay as, 1919, Serial No. 299,209.

To all whom it may concern:

Be it known that I, Louis STnrNBERoER, a citizen of the United States, and a resident of the boron h of Brookl 11, county of Kings, city and tate of New ork, have invented certain new and useful Improvements in Column-Strain Insulators, of which the followin is a specification.

This invention re ates to a column strain insulator of the rod type and more particularly to th improved terminals therefor.

One of the objects of the invention is to provide a column strain insulator having at each end a cup-shaped terminal secured thereto, and upon which are mounted hell or skirt shaped membei'swhich are adjustable with respect to each other and to a disc-shaped member disposed and secured centrally of the insulated column.

Another object is to provide a column strain insulator having at each end a cupshaped terminal adjustably secured thereto, the securing means of said terminal being such that the insulator body retains its maximum strength.

Another object of the invention is to provide a rod type strain insulator with a cup shaped terminal molded or anchored at each end for the protection thereof, and provided also with flaring skirt or bell shaped members adjustably secured to the terminals, the skirt portions extending around and free from the insulator at both ends and projecting towards each other and towards a disc-shaped member rigidly secured to the central portion of the insulator body so that the two members may assume various positions with respect to each other in order to provide adjustable arcing means for the insulated structure.

Other .objects will appear from the subjoined specification and claims.

The invention is an improvement over the structures shown in my copending applications Serial No. 265,490, filed December 6, 1918, and Serial No. 266,051, filed December 10, 1918, and is, therefore, a continuation in part of each of these two applications.

Referring to the drawin s:

Th figure is a longitu inal section of a structure embodying my invention.

In the drawing, 10 represents a body of insulating mater al which is of rod type, and it is provided on its outer surface with a series of circumferential ridges 11 and grooves'12, as shown, to increase its surface Renewed September 16, 1821. Serial Io. 601,147.

area. At each end of the insulator an improved arcing terminal is provided, and as the terminals at each end are the same in structure andare applied to the rod of insulating material the same way during the process of manufacture-it is only necessary 1n the interest of brevity to describe the structure at one end. In the drawin the terminals are shown in .full lines in then innermost positions, and at one end a terminal 15 shown in dotted lines in an outer adjusted position, to illustrate th capabilities of ad- ]ustment of the respective terminals with respect to each other and to the insulator body.

A cup shaped terminal cap 11 is molded and anchored to each end of the insulating material 10 which latter may be made of any suitable insulating material but preferably of that material known in the art as electrose.

This portion of the terminal is provided at its inner edge with an interiorly disposed bead 12 for the purpose of anchoring the cap to the insulatin material when it is molded thereto. In addition to the bead 12 within the inner rim of the cup 11 there are four holes or apertures 13 in the side of the hell or cup, oppositely disposed to each other and approximately 90 degrees apart and located centrally in relation to the cup.

These apertures are filled with electrose, as clearly illustrated in the drawing, durin the course of manufacture when the insu ator body is molded to the cup sha d terminal. The outer surface of the e ectrose remains flush with the outer surface of the cup shaped portion of the metal terminal, thus providing additional and ample anchorages to decrease the likelihood of the bell shaped terminal being pulled away from the end of the rod of insulating material.

Extending from the end of the cup shaped portion at the center thereof, is a shank 20 which is screw-threaded at 21 for the purpose of 'ad'ustably mounting thereon the flared skirt or ell shaped terminal member 30 which fits onto the screw-threaded shank 20 of the on shaped terminal 11, the skirt portion or flange 31 of one member 30 extending towards the other.

The outer edge of the skirt portion of the bell shaped arcing element is beaded as at 32. A screw-threaded cavity 33 is provided at the center of the base of each bell-shaped member to engage with the screw-threaded shank or neck of themember 11. The outer surface of the member 11 adjacent the neck portion 20 and the inner surface of the member adjacent the screw-threaded cavity 33, are respectively so curved or shaped that the member 30 fits very closely upon the member 11. The hell or skirt shaped metallic member 30 is provided at the end of the neck portion with a head portion which has an eyelet therein in order to secure the same to a support, to a line or to an adjacent insulator.

A disc shaped member having a central opening 51 is secured to the central portion of the body of insulating material 10. In the event that the body 10 is first formed, the central opening 51 of the disc 50 and the said disc are secured to the body by any suitable cementitious material, as clearly shown and as well known. This member 50 may be made either of conducting material, such as metal, or it may be made of insulating material instead of metal. It is secured to the body 10 of insulating material in any suitable manner but preferably by molding it to the body of insulating material during the process of manufacture.

The object of the disc shaped member is for the purpose of preventing the electric arc, when the insulator is in use, from touchin the insulator body, in order to prevent in ury to or destruction of the insulator. Therefore, owing to the flaring skirts of the members 30 the electric arc is thrown away from the body portion of the insulator. As indicated by the dotted lines w, y, the electric arc will tend to converge upon the periphery of the disc-shaped member 50, thereby reventing injury and destruction of the dy of-insulating material.

As both the flaring members are adjustable in relation to each other and to the centrally disposed disc 50, the engineers are enabled to space these members in relation to each other and to the said disc 50 in accordance with the requirements.

To illustrate, if a current of 50,00 volts is just sulficient to cause an arcing to take place when the bell or skirt shaped members are in the position shown in full lines in the drawing then a current of 75,000 to 80,000 volts would be required to are across when they are adjusted to the positions indicated in dotted lines in the drawing. The structure may thus be utilized for any desired service.

As changes of construction could be made within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention what I claim and desire to secure by Letters Patent is In a device of the class described, an elongated body of insulating material, end caps each having a bead and also a cavity formed therein to effect a molded union with said insulating body, and an axially extending screw-threaded shank secured thereto, a bell shaped terminal-threaded on each shank to adjust its position thereon, said terminals each having an annular bead formed at one end and a securing eye adapted to receive a supporting wire formed on the other end thereof, and a disc shaped barrier surrounding said insulating body at a point substantially half way between said end caps, coacting with the beads on said terminals to act as an arcing member to prevent injury to said body of insulating material.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 19th day of May, 1919.

LOUIS STEINBERGE-R. In the presence of ISABEL R. FLETCHER. 

